Preheat oven to 350 degrees. Spray and flour a 9x13 baking dish; line the bottom with parchment paper and lightly grease.
In a medium mixing bowl, combine sugar, brown sugar, eggs, butter, and oil until smooth. Gently stir in flour and vanilla. Finally, mix in 1 & 1/2 cups chopped pecans.
Pour mixture into prepared baking dish.
Sprinkle the remaining (1/2 cup) chopped pecans on top